note* to toast walnuts, bake them in a shallow pan at 375.
In a medium mixing bowl, whisk together flour, baking powder, salt and the sugars. With a pastry blender, cut in the butter until mixture resembles crumbs.
Add the cheeseand toss to combine.
Remove 3/4 cup of the mixture and set aside.
Press the remaining mixture evenly into the bottom of a greased 8" square baking pan. Spread the jam evenly over the crust. Sprinkle the nuts over the jam and top with the reserved crumb mixture, pressing the crumbs gently into the jam.
Bake for 25-30 minutes, or until golden. Cool completely, in the pan then cut into 1x2" squares.
Cover with plastic wrap and store in the refrigerator.